I believe it could be argued that the jockey would be “Adayta D’Nafshei”, as the jockey wants to win the race.
So you’re being mattir all amira l’akum where the nochri wants to succeed at his job? ?? ????? ??? ???.
Adayta d’nafshei would apply where he didn’t have to do it on Shabbos but chose to. I don’t think they’d let him run the race on Friday and have the other horses run on Shabbos.
Or, perhaps you’re thinking of the issur to benefit, where we consider the intention of the nochri. However, I’m referring to the actual maaseh.
The prize money includes all of the pre-race work needed to enter, so that would be Havla’ah.
No it doesn’t. The prize money is for winning the race.